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B, C and D

Step-by-step explanation:

5x - 10 = 4x + 7 ( vertical angles )

Subtract 4x from both sides )

x - 10 = 7 ( add 10 to both sides )

x = 17

Thus

4x + 7 = 4(17) + 7 = 68 + 7 = 75° ⇒ D

and

4x - 14 = 4(17) - 14 = 68 - 14 = 54° ⇒ C

The sum of the 3 angles in the triangle = 180°

subtract the sum of the 2 angles from 180 for third angle

third angle = 180° - (75 + 54)° = 180° - 129° = 51° ⇒ B

it is true

step-by-step explanation:

all the combinations add up i used   calculator